| Presentation | 2008-03-07 A Key Issue for MBWA Systems (2) : Reasons of Throughput Impairment by Inter-sector Interference Noboru IZUKA, Yasuyoshi ASANO, Yoshiharu YAMAZAKI, Hiroshi OGUMA, Suguru KAMEDA, Hiroyuki NAKASE, Tadashi TAKAGI, Kazuo TSUBOUCHI, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Mobile broadband wireless access (MBWA) systems are attractive candidates for next generation mobile data communication systems. This paper discusses results of the MBWA system field trial with Fast Low-latency Access with Seamless Handoff Orthogonal Frequency Division Multiplexing (FLASH-OFDM). Field trial results show that the downlink throughput performance is significantly impaired by inter-sector interference. To clarify the reasons of the impairment, we carry out a computer simulation on inter-sector interference reduction capability of frequency hopping orthogonal frequency division multiple access (FH-OFDMA), which is used as a multiple access scheme in FLASH-OFDM. The results summarizes as follows. (1) The interference reduction capability of FH-OFDMA is almost the same as that of direct sequence code division multiple access (DS-CDMA), which can allocate the same frequency band to all sectors. (2) In FH-OFDMA, a long hopping-pattern length yields no site diversity effect to reduce inter-sector interference. Additionally, cumulative distribution of measured signal to noise and interference ratio (SNIR) shows that pilot signals in the neighboring sectors mainly impair the throughput performance. Since a sectored cell layout is mandatory for deployment of the MBWA systems in a high traffic area, inter-sector interference reduction is a key issue for the systems. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | MBWA / FH-OFDMA / FLASH-OFDM / Field trial |
| Paper # | WBS2007-106 |
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| Committee | WBS |
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| Conference Date | 2008/2/29(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Registration To | Wideband System(WBS) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Key Issue for MBWA Systems (2) : Reasons of Throughput Impairment by Inter-sector Interference |
| Sub Title (in English) | |
| Keyword(1) | MBWA |
| Keyword(2) | FH-OFDMA |
| Keyword(3) | FLASH-OFDM |
| Keyword(4) | Field trial |
| 1st Author's Name | Noboru IZUKA |
| 1st Author's Affiliation | Laboratory, Softbank Telecom Corp.() |
| 2nd Author's Name | Yasuyoshi ASANO |
| 2nd Author's Affiliation | Laboratory, Softbank Telecom Corp. |
| 3rd Author's Name | Yoshiharu YAMAZAKI |
| 3rd Author's Affiliation | Laboratory, Softbank Telecom Corp. |
| 4th Author's Name | Hiroshi OGUMA |
| 4th Author's Affiliation | Industrial Technology Institute of Miyagi Prefecture Government |
| 5th Author's Name | Suguru KAMEDA |
| 5th Author's Affiliation | Research Institute of Electrical Communication, Tohoku University |
| 6th Author's Name | Hiroyuki NAKASE |
| 6th Author's Affiliation | Research Institute of Electrical Communication, Tohoku University |
| 7th Author's Name | Tadashi TAKAGI |
| 7th Author's Affiliation | Research Institute of Electrical Communication, Tohoku University |
| 8th Author's Name | Kazuo TSUBOUCHI |
| 8th Author's Affiliation | Research Institute of Electrical Communication, Tohoku University |
| Date | 2008-03-07 |
| Paper # | WBS2007-106 |
| Volume (vol) | vol.107 |
| Number (no) | 520 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |